Ch 'When the canny proprietor pulled a charming etui containing several miniature tablets and a stylus from a cabinet, she succumbed to purchasing that also.' (probably the workshop of) Rogier van der Weyden, about Pietà, detail of wax tablet etui
The Wax Tablets of the City of Toruń (The second half of the century - Wax tablets were used as notebooks. The writer would press a stylus into the soft wax to write on it. Then the wax could later be heated to smooth out the writing to make reuse it.